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Kohei Watanabe, Motoki Kouzaki and Toshio Moritani

In some muscles, nonuniform surface electromyography (EMG) responses have been demonstrated within a muscle, meaning that the electrode location could be critical in the results of surface EMG. The current study investigated possible region-specific EMG responses within the human biceps femoris (BF) muscle. Surface EMG was recorded from various regions along the longitudinal axis of the BF muscle with 20 electrodes. Ten healthy men performed maximal isometric contractions of hip extension and knee flexion, which involve the BF muscle. The ratio of the EMG amplitude between hip extension and knee flexion tasks (HE/KF) was calculated and compared among the regions. There were no significant differences in HE/KF among the regions along the BF muscle (P > .05). This suggests that the entire superficial region of the BF muscle is equally regulated in the 2 different tasks. We suggest that the electrode location is not critical in estimating the activation properties and/or functional role of the superficial region, which corresponds with approximately 50% of the muscle length of the BF muscle, using surface EMG during maximal contraction.

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Taija Finni and Sulin Cheng

The positions of EMG electrodes over the knee extensor muscles were examined in 19 healthy men using MR images; electrodes were placed according to the SENIAM (surface electromyography for non-invasive assessment of muscles) guidelines. From axial images, the medial and lateral borders of the muscles were identified, and the arc length of the muscle surface was measured. The electrode location was expressed as a percentage value from the muscle’s medial border. EMGs were recorded during isometric maximal contraction, squat jumps, and countermovement jumps and analyzed for cross-correlation. The results showed that variations in lateral positioning were greatest in vastus medialis (47% SD 11) and rectus femoris (68% SD 15). In vastus lateralis, the electrode was usually placed close to the rectus femoris (19% SD 6). The peak cross-correlation coefficient varied between 0.15 and 0.68, but was not associated with electrode location. It is recommended that careful consideration is given to the medial-lateral positioning of the vastus lateralis electrodes especially, so that the electrodes are positioned over the mid-muscle rather than in close proximity to rectus femoris.

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Sprints in Amputee Sprinters Using Running-Specific Prostheses Hiroaki Hobara * Wolfgang Potthast * Ralf Müller * Yoshiyuki Kobayashi * Thijs A. Heldoorn * Masaaki Mochimaru * 2 2016 32 1 93 96 10.1123/jab.2014-0297 Effect of Electrode Location on Task-Dependent Electromyography Responses

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Walaa M. Elsais, Stephen J. Preece, Richard K. Jones and Lee Herrington

. Figure 1 —(A) Example of ultrasound probe locations used to map out the boundaries of the 3 adductor muscles. (B) The protocol for determining the electrode location along the length of the muscle, measured from the greater trochanter to the lateral joint line. Note: a–f denote the positions of the

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Christopher A. Bailey, Maxana Weiss and Julie N. Côté

Electrode Locations, RVIC Postures, and Rationale for Each Muscle Muscle Electrode location RVIC posture Rationale UT Midpoint of the acromion and C7 spinous processes Standing, holding the arms straight, and shoulders abducted 90° in the frontal plane Based on previous reported positioning ( Mathiassen

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Mohammad H. Izadi Farhadi, Foad Seidi, Hooman Minoonejad and Abbey C. Thomas

Electromyography data were sampled at 1000 Hz (ME6000 Megawin; Mega Electronics Ltd, Kuopio, Finland), with a common mode rejection of 110 dB, preamplifier gain of 305, and input impedance >10 MW at 100 Hz. Prior to electrode placement, the electrode location was shaved and then cleaned with alcohol. Next

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Stephen M. Suydam, Kurt Manal and Thomas S. Buchanan

I , Merlo A , Degola P et al . Effect of electrode location on EMG signal envelope in leg muscles during gait . J Electromyogr Kinesiol . 2007 ; 17 ( 4 ): 515 – 526 . PubMed doi: 10.1016/j.jelekin.2006.06.001 16889982 10. Jenkins NDM , Buckner SL , Cochrane KC et al . Age

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Leonardo Shigaki, Cynthia Gobbi Alves Araújo, Mariane Guizeline Calderon, Thais Karoline Cezar Costa, Andreo Fernando Aguiar, Leonardo Oliveira Pena Costa and Rubens A. da Silva

electrode was positioned over the T8 spinous process. To secure the placement of electrodes for the preintervention and postintervention assessments, a template was produced during the baseline measure (presession) by copying electrode locations as well as natural skin blemishes on an acetate. In this study

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Benjamin S. Killen, Krista L. Zelizney and Xin Ye

recommendations from the SENIAM project. 29 The electrodeslocations were recorded and marked with a pen to ensure the electrodes were placed on the exact same spots during all visits. A reference electrode (5.08-cm diameter Dermatrode HE-R; American Imex, Irvine, CA) was placed over the seventh cervical

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Justin L. Rush, Lindsey K. Lepley, Steven Davi and Adam S. Lepley

. Similar to Cogiamanian et al, 29 Angius et al 30 also investigated the effects of different tDCS electrode locations on lower limb isometric exercise and endurance time. Muscle strength decreased significantly after the endurance trials, but the rate of perceived exhaustion and time to exhaustion was